:root {
    --primary-color: #4f46e5;
    --secondary-color: #6366f1;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --seedream-color: #ff6b35;
    --nano-color: #34d399;
}

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.main-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    margin: 2rem auto;
    padding: 2rem;
    max-width: 1400px;
}

.language-selector {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
}

.language-btn {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid #dee2e6;
    border-radius: 25px;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.language-btn:hover {
    background: white;
    transform: translateY(-2px);
}

.header h1 {
    background: linear-gradient(45deg, var(--primary-color), var(--seedream-color), var(--nano-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: bold;
    text-align: center;
    margin-bottom: 0.5rem;
}

.form-container,
.result-container {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
}

.advanced-section {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 1rem;
    margin-top: 1rem;
    border: 2px dashed #dee2e6;
}

/* Multi-image upload styles */
.multi-image-upload {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.multi-image-title {
    color: white;
    text-align: center;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.image-upload-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.image-upload-slot {
    position: relative;
    background: rgba(255, 255, 255, 0.1);
    border: 2px dashed rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.image-upload-slot:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

.image-upload-slot.dragover {
    background: rgba(255, 107, 53, 0.2);
    border-color: var(--seedream-color);
}

.image-upload-slot.has-image {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--success-color);
}

.slot-label {
    color: white;
    font-weight: 500;
    margin-bottom: 0.5rem;
    text-align: center;
}

.has-image .slot-label {
    color: #333;
}

.slot-icon {
    color: rgba(255, 255, 255, 0.7);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.has-image .slot-icon {
    display: none;
}

.slot-text {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    text-align: center;
}

.has-image .slot-text {
    display: none;
}

.preview-image {
    max-width: 100%;
    max-height: 150px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.image-controls {
    position: absolute;
    top: 5px;
    right: 5px;
    display: flex;
    gap: 5px;
}

.control-btn {
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.control-btn:hover {
    background: white;
    transform: scale(1.1);
}

.control-btn.remove {
    color: var(--danger-color);
}

.control-btn.replace {
    color: var(--primary-color);
}

.file-input {
    display: none;
}

.file-info {
    position: absolute;
    bottom: 5px;
    left: 5px;
    right: 5px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    text-align: center;
}

.btn-generate {
    background: linear-gradient(45deg, var(--primary-color), var(--seedream-color), var(--nano-color));
    border: none;
    border-radius: 10px;
    padding: 12px 30px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(79, 70, 229, 0.4);
}

.generated-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.generated-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.generated-image:hover {
    transform: scale(1.02);
}

.download-btn {
    transition: all 0.3s ease;
}

.download-btn:hover:not(.downloading) {
    background-color: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
    color: white !important;
}

.download-btn.downloading {
    background-color: #6c757d !important;
    border-color: #6c757d !important;
    color: white !important;
    pointer-events: none;
}

.model-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-left: 5px;
}

.nano-badge {
    background: linear-gradient(45deg, var(--nano-color), #10b981);
    color: white;
}

.seedream-badge {
    background: linear-gradient(45deg, var(--seedream-color), #ff8a65);
    color: white;
}

@media (max-width: 768px) {
    .main-container {
        margin: 1rem;
        padding: 1rem;
    }

    .language-selector {
        position: static;
        margin-bottom: 1rem;
        text-align: center;
    }

    .image-upload-grid {
        grid-template-columns: 1fr;
    }

    .generated-images {
        grid-template-columns: 1fr;
    }
}